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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
4 * Copyright (c) 2015, Sony Mobile Communications AB
5 */
6
7#include <linux/hwspinlock.h>
8#include <linux/io.h>
9#include <linux/kernel.h>
10#include <linux/mfd/syscon.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/of_device.h>
14#include <linux/platform_device.h>
15#include <linux/regmap.h>
16
17#include "hwspinlock_internal.h"
18
19#define QCOM_MUTEX_APPS_PROC_ID 1
20#define QCOM_MUTEX_NUM_LOCKS 32
21
22struct qcom_hwspinlock_of_data {
23 u32 offset;
24 u32 stride;
25 const struct regmap_config *regmap_config;
26};
27
28static int qcom_hwspinlock_trylock(struct hwspinlock *lock)
29{
30 struct regmap_field *field = lock->priv;
31 u32 lock_owner;
32 int ret;
33
34 ret = regmap_field_write(field, QCOM_MUTEX_APPS_PROC_ID);
35 if (ret)
36 return ret;
37
38 ret = regmap_field_read(field, &lock_owner);
39 if (ret)
40 return ret;
41
42 return lock_owner == QCOM_MUTEX_APPS_PROC_ID;
43}
44
45static void qcom_hwspinlock_unlock(struct hwspinlock *lock)
46{
47 struct regmap_field *field = lock->priv;
48 u32 lock_owner;
49 int ret;
50
51 ret = regmap_field_read(field, &lock_owner);
52 if (ret) {
53 pr_err("%s: unable to query spinlock owner\n", __func__);
54 return;
55 }
56
57 if (lock_owner != QCOM_MUTEX_APPS_PROC_ID) {
58 pr_err("%s: spinlock not owned by us (actual owner is %d)\n",
59 __func__, lock_owner);
60 }
61
62 ret = regmap_field_write(field, 0);
63 if (ret)
64 pr_err("%s: failed to unlock spinlock\n", __func__);
65}
66
67static const struct hwspinlock_ops qcom_hwspinlock_ops = {
68 .trylock = qcom_hwspinlock_trylock,
69 .unlock = qcom_hwspinlock_unlock,
70};
71
72static const struct regmap_config sfpb_mutex_config = {
73 .reg_bits = 32,
74 .reg_stride = 4,
75 .val_bits = 32,
76 .max_register = 0x100,
77 .fast_io = true,
78};
79
80static const struct qcom_hwspinlock_of_data of_sfpb_mutex = {
81 .offset = 0x4,
82 .stride = 0x4,
83 .regmap_config = &sfpb_mutex_config,
84};
85
86static const struct regmap_config tcsr_msm8226_mutex_config = {
87 .reg_bits = 32,
88 .reg_stride = 4,
89 .val_bits = 32,
90 .max_register = 0x1000,
91 .fast_io = true,
92};
93
94static const struct qcom_hwspinlock_of_data of_msm8226_tcsr_mutex = {
95 .offset = 0,
96 .stride = 0x80,
97 .regmap_config = &tcsr_msm8226_mutex_config,
98};
99
100static const struct regmap_config tcsr_mutex_config = {
101 .reg_bits = 32,
102 .reg_stride = 4,
103 .val_bits = 32,
104 .max_register = 0x20000,
105 .fast_io = true,
106};
107
108static const struct qcom_hwspinlock_of_data of_tcsr_mutex = {
109 .offset = 0,
110 .stride = 0x1000,
111 .regmap_config = &tcsr_mutex_config,
112};
113
114static const struct of_device_id qcom_hwspinlock_of_match[] = {
115 { .compatible = "qcom,sfpb-mutex", .data = &of_sfpb_mutex },
116 { .compatible = "qcom,tcsr-mutex", .data = &of_tcsr_mutex },
117 { .compatible = "qcom,apq8084-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
118 { .compatible = "qcom,msm8226-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
119 { .compatible = "qcom,msm8974-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
120 { .compatible = "qcom,msm8994-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
121 { }
122};
123MODULE_DEVICE_TABLE(of, qcom_hwspinlock_of_match);
124
125static struct regmap *qcom_hwspinlock_probe_syscon(struct platform_device *pdev,
126 u32 *base, u32 *stride)
127{
128 struct device_node *syscon;
129 struct regmap *regmap;
130 int ret;
131
132 syscon = of_parse_phandle(pdev->dev.of_node, "syscon", 0);
133 if (!syscon)
134 return ERR_PTR(-ENODEV);
135
136 regmap = syscon_node_to_regmap(syscon);
137 of_node_put(syscon);
138 if (IS_ERR(regmap))
139 return regmap;
140
141 ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 1, base);
142 if (ret < 0) {
143 dev_err(&pdev->dev, "no offset in syscon\n");
144 return ERR_PTR(-EINVAL);
145 }
146
147 ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 2, stride);
148 if (ret < 0) {
149 dev_err(&pdev->dev, "no stride syscon\n");
150 return ERR_PTR(-EINVAL);
151 }
152
153 return regmap;
154}
155
156static struct regmap *qcom_hwspinlock_probe_mmio(struct platform_device *pdev,
157 u32 *offset, u32 *stride)
158{
159 const struct qcom_hwspinlock_of_data *data;
160 struct device *dev = &pdev->dev;
161 void __iomem *base;
162
163 data = of_device_get_match_data(dev);
164 if (!data->regmap_config)
165 return ERR_PTR(-EINVAL);
166
167 *offset = data->offset;
168 *stride = data->stride;
169
170 base = devm_platform_ioremap_resource(pdev, 0);
171 if (IS_ERR(base))
172 return ERR_CAST(base);
173
174 return devm_regmap_init_mmio(dev, base, data->regmap_config);
175}
176
177static int qcom_hwspinlock_probe(struct platform_device *pdev)
178{
179 struct hwspinlock_device *bank;
180 struct reg_field field;
181 struct regmap *regmap;
182 size_t array_size;
183 u32 stride;
184 u32 base;
185 int i;
186
187 regmap = qcom_hwspinlock_probe_syscon(pdev, &base, &stride);
188 if (IS_ERR(regmap) && PTR_ERR(regmap) == -ENODEV)
189 regmap = qcom_hwspinlock_probe_mmio(pdev, &base, &stride);
190
191 if (IS_ERR(regmap))
192 return PTR_ERR(regmap);
193
194 array_size = QCOM_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock);
195 bank = devm_kzalloc(&pdev->dev, sizeof(*bank) + array_size, GFP_KERNEL);
196 if (!bank)
197 return -ENOMEM;
198
199 platform_set_drvdata(pdev, bank);
200
201 for (i = 0; i < QCOM_MUTEX_NUM_LOCKS; i++) {
202 field.reg = base + i * stride;
203 field.lsb = 0;
204 field.msb = 31;
205
206 bank->lock[i].priv = devm_regmap_field_alloc(&pdev->dev,
207 regmap, field);
208 if (IS_ERR(bank->lock[i].priv))
209 return PTR_ERR(bank->lock[i].priv);
210 }
211
212 return devm_hwspin_lock_register(&pdev->dev, bank, &qcom_hwspinlock_ops,
213 0, QCOM_MUTEX_NUM_LOCKS);
214}
215
216static struct platform_driver qcom_hwspinlock_driver = {
217 .probe = qcom_hwspinlock_probe,
218 .driver = {
219 .name = "qcom_hwspinlock",
220 .of_match_table = qcom_hwspinlock_of_match,
221 },
222};
223
224static int __init qcom_hwspinlock_init(void)
225{
226 return platform_driver_register(&qcom_hwspinlock_driver);
227}
228/* board init code might need to reserve hwspinlocks for predefined purposes */
229postcore_initcall(qcom_hwspinlock_init);
230
231static void __exit qcom_hwspinlock_exit(void)
232{
233 platform_driver_unregister(&qcom_hwspinlock_driver);
234}
235module_exit(qcom_hwspinlock_exit);
236
237MODULE_LICENSE("GPL v2");
238MODULE_DESCRIPTION("Hardware spinlock driver for Qualcomm SoCs");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
4 * Copyright (c) 2015, Sony Mobile Communications AB
5 */
6
7#include <linux/hwspinlock.h>
8#include <linux/io.h>
9#include <linux/kernel.h>
10#include <linux/mfd/syscon.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/of_device.h>
14#include <linux/platform_device.h>
15#include <linux/regmap.h>
16
17#include "hwspinlock_internal.h"
18
19#define QCOM_MUTEX_APPS_PROC_ID 1
20#define QCOM_MUTEX_NUM_LOCKS 32
21
22static int qcom_hwspinlock_trylock(struct hwspinlock *lock)
23{
24 struct regmap_field *field = lock->priv;
25 u32 lock_owner;
26 int ret;
27
28 ret = regmap_field_write(field, QCOM_MUTEX_APPS_PROC_ID);
29 if (ret)
30 return ret;
31
32 ret = regmap_field_read(field, &lock_owner);
33 if (ret)
34 return ret;
35
36 return lock_owner == QCOM_MUTEX_APPS_PROC_ID;
37}
38
39static void qcom_hwspinlock_unlock(struct hwspinlock *lock)
40{
41 struct regmap_field *field = lock->priv;
42 u32 lock_owner;
43 int ret;
44
45 ret = regmap_field_read(field, &lock_owner);
46 if (ret) {
47 pr_err("%s: unable to query spinlock owner\n", __func__);
48 return;
49 }
50
51 if (lock_owner != QCOM_MUTEX_APPS_PROC_ID) {
52 pr_err("%s: spinlock not owned by us (actual owner is %d)\n",
53 __func__, lock_owner);
54 }
55
56 ret = regmap_field_write(field, 0);
57 if (ret)
58 pr_err("%s: failed to unlock spinlock\n", __func__);
59}
60
61static const struct hwspinlock_ops qcom_hwspinlock_ops = {
62 .trylock = qcom_hwspinlock_trylock,
63 .unlock = qcom_hwspinlock_unlock,
64};
65
66static const struct of_device_id qcom_hwspinlock_of_match[] = {
67 { .compatible = "qcom,sfpb-mutex" },
68 { .compatible = "qcom,tcsr-mutex" },
69 { }
70};
71MODULE_DEVICE_TABLE(of, qcom_hwspinlock_of_match);
72
73static struct regmap *qcom_hwspinlock_probe_syscon(struct platform_device *pdev,
74 u32 *base, u32 *stride)
75{
76 struct device_node *syscon;
77 struct regmap *regmap;
78 int ret;
79
80 syscon = of_parse_phandle(pdev->dev.of_node, "syscon", 0);
81 if (!syscon)
82 return ERR_PTR(-ENODEV);
83
84 regmap = syscon_node_to_regmap(syscon);
85 of_node_put(syscon);
86 if (IS_ERR(regmap))
87 return regmap;
88
89 ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 1, base);
90 if (ret < 0) {
91 dev_err(&pdev->dev, "no offset in syscon\n");
92 return ERR_PTR(-EINVAL);
93 }
94
95 ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 2, stride);
96 if (ret < 0) {
97 dev_err(&pdev->dev, "no stride syscon\n");
98 return ERR_PTR(-EINVAL);
99 }
100
101 return regmap;
102}
103
104static const struct regmap_config tcsr_mutex_config = {
105 .reg_bits = 32,
106 .reg_stride = 4,
107 .val_bits = 32,
108 .max_register = 0x40000,
109 .fast_io = true,
110};
111
112static struct regmap *qcom_hwspinlock_probe_mmio(struct platform_device *pdev,
113 u32 *offset, u32 *stride)
114{
115 struct device *dev = &pdev->dev;
116 void __iomem *base;
117
118 /* All modern platform has offset 0 and stride of 4k */
119 *offset = 0;
120 *stride = 0x1000;
121
122 base = devm_platform_ioremap_resource(pdev, 0);
123 if (IS_ERR(base))
124 return ERR_CAST(base);
125
126 return devm_regmap_init_mmio(dev, base, &tcsr_mutex_config);
127}
128
129static int qcom_hwspinlock_probe(struct platform_device *pdev)
130{
131 struct hwspinlock_device *bank;
132 struct reg_field field;
133 struct regmap *regmap;
134 size_t array_size;
135 u32 stride;
136 u32 base;
137 int i;
138
139 regmap = qcom_hwspinlock_probe_syscon(pdev, &base, &stride);
140 if (IS_ERR(regmap) && PTR_ERR(regmap) == -ENODEV)
141 regmap = qcom_hwspinlock_probe_mmio(pdev, &base, &stride);
142
143 if (IS_ERR(regmap))
144 return PTR_ERR(regmap);
145
146 array_size = QCOM_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock);
147 bank = devm_kzalloc(&pdev->dev, sizeof(*bank) + array_size, GFP_KERNEL);
148 if (!bank)
149 return -ENOMEM;
150
151 platform_set_drvdata(pdev, bank);
152
153 for (i = 0; i < QCOM_MUTEX_NUM_LOCKS; i++) {
154 field.reg = base + i * stride;
155 field.lsb = 0;
156 field.msb = 31;
157
158 bank->lock[i].priv = devm_regmap_field_alloc(&pdev->dev,
159 regmap, field);
160 }
161
162 return devm_hwspin_lock_register(&pdev->dev, bank, &qcom_hwspinlock_ops,
163 0, QCOM_MUTEX_NUM_LOCKS);
164}
165
166static struct platform_driver qcom_hwspinlock_driver = {
167 .probe = qcom_hwspinlock_probe,
168 .driver = {
169 .name = "qcom_hwspinlock",
170 .of_match_table = qcom_hwspinlock_of_match,
171 },
172};
173
174static int __init qcom_hwspinlock_init(void)
175{
176 return platform_driver_register(&qcom_hwspinlock_driver);
177}
178/* board init code might need to reserve hwspinlocks for predefined purposes */
179postcore_initcall(qcom_hwspinlock_init);
180
181static void __exit qcom_hwspinlock_exit(void)
182{
183 platform_driver_unregister(&qcom_hwspinlock_driver);
184}
185module_exit(qcom_hwspinlock_exit);
186
187MODULE_LICENSE("GPL v2");
188MODULE_DESCRIPTION("Hardware spinlock driver for Qualcomm SoCs");